<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>试试</title>
</head>
<body>
<form action="/hello" method="post" >
    用户名:<input type="text" name="username" value="admin"/><br>
    密码：<input type="text" name="password" value="123456"/><br>
    <input type="submit" value="登陆"/>
</form>

</body>
</html>